body{
    background-color: black;
}

#myBtn {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 30px;
    z-index: 99;
    font-size: 18px;
    border: none;
    outline: none;
    background-color: red;
    color: white;
    cursor: pointer;
    padding: 15px;
    border-radius: 4px;
}

#myBtn:hover {
    background-color: #555;
}


.qrcode-box{
    /* margin-bottom: 20px; */
    margin-top: 1rem;
    margin-bottom: 1rem;
    border-radius: 0.5rem;
    background-color: #f9fafb;
    
    color: #374151;
    display: flex;
    justify-content: space-between;
    border: 1px solid #efefef;
    box-shadow: 2px 4px 7px #ccc;
}